VirtualBox errors after installing Windows Phone SDK

For my work on SharePoint, I’m running VirtualBox on my Windows 8.1 laptop. Today, after installing the Windows Phone SDK for Visual Studio, those VM’s suddenly would not start any more. The error displayed: "vt-x is not available (VERR_VMX_NO_VMX)" Uhm ok. What happened? Well, part of the SDK installation is Hyper-V. They use Hyper-v to

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